#include <REGX52.H>
#include <INTRINS.H>

void Delay500ms(void)	//@12.000MHz
{
	unsigned char data i, j, k;

	_nop_();
	i = 4;
	j = 205;
	k = 187;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}

void main()
	{
		while(1)
			{
			  P2=0xFE;//1111 1110
				Delay500ms();
				P2=0xFD;//1111 1101
				Delay500ms();
			  P2=0xFB;//1111 1011
				Delay500ms();
			  P2=0xF7;//1111 0111
				Delay500ms();
			  P2=0xEF;//1110 1111
				Delay500ms();
			  P2=0xDF;//1101 1111
				Delay500ms();
				P2=0xBF;//1011 1111
				Delay500ms();
				P2=0x7F;//0111 1111
				Delay500ms();
			}

	}